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Capital Stock (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Summary of Common Share Activity

A summary of common share activity for the years ended December 31 follows (in shares):

						2021						2020						2019
Common shares outstanding at January 1						134,801,030						135,577,878						135,173,948
Shares repurchased						(9,121,328)						(1,240,328)						(106,388)
Shares issued upon exercise of employee stock options						—						—						70,000
Restricted stock issued to employees, net of forfeitures						435,129						439,700						416,695
Shares issued to non-employee directors						16,968						23,780						23,623
Common shares outstanding at December 31						126,131,799						134,801,030						135,577,878

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